# -*- mode: python; -*-
"""
Support code related to OS detection in general. System specific facilities or customization
hooks live in mongo_platform_<PLATFORM>.py files.
"""

import os
import platform

# --- OS identification ---
#
# This needs to precede the options section so that we can only offer some options on certain
# operating systems.


# This function gets the running OS as identified by Python
# It should only be used to set up defaults for options/variables, because
# its value could potentially be overridden by setting TARGET_OS on the
# command-line. Treat this output as the value of HOST_OS
def get_running_os_name():
    running_os = os.sys.platform
    if running_os.startswith("linux"):
        running_os = "linux"
    elif running_os.startswith("freebsd"):
        running_os = "freebsd"
    elif running_os.startswith("openbsd"):
        running_os = "openbsd"
    elif running_os == "sunos5":
        running_os = "solaris"
    elif running_os == "win32":
        running_os = "windows"
    elif running_os == "darwin":
        running_os = "macOS"
    else:
        running_os = "unknown"
    return running_os


def env_get_os_name_wrapper(self):
    return self["TARGET_OS"]


def is_os_raw(target_os, os_list_to_check):
    darwin_os_list = ["macOS", "tvOS", "tvOS-sim", "iOS", "iOS-sim", "watchOS", "watchOS-sim"]
    linux_os_list = ["android", "linux"]
    posix_os_list = ["openbsd", "freebsd", "solaris", "emscripten"] + darwin_os_list + linux_os_list

    os_families = {
        "darwin": darwin_os_list,
        "posix": posix_os_list,
        "linux": linux_os_list,
    }

    for os in os_list_to_check:
        if os == target_os or (os in os_families and target_os in os_families[os]):
            return True
    return False


# This function tests the running OS as identified by Python
# It should only be used to set up defaults for options/variables, because
# its value could potentially be overridden by setting TARGET_OS on the
# command-line. Treat this output as the value of HOST_OS
def is_running_os(*os_list):
    return is_os_raw(get_running_os_name(), os_list)


def env_os_is_wrapper(self, *os_list):
    return is_os_raw(self["TARGET_OS"], os_list)


def is_arm_processor():
    arch = platform.machine().lower()

    if "arm" in arch or "aarch64" in arch:
        return True

    return False
